chore(deps): update dependency nsubstitute to 6.1.0

[thomhurst]

This PR contains the following updates:

Package	Type	Update	Change
NSubstitute (source)	nuget	minor	6.0.0 → 6.1.0

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Release Notes

nsubstitute/NSubstitute (NSubstitute)

v6.1.0

• [UPDATE] Revert nullability support from 6.0. This change caused a number of problems for callers (#​973, #​976), and
  trying to resolve these (#​976) revealed the need for more fundamental changes to NSubstitute to effectively support this.
  As a result, nullability is again disabled for public API.
  Huge thanks to @​jdb0123, @​Romfos, and @​Moha-sami for their PRs addressing this, and thanks for all those who raised
  issues. We also humbly award @​zvirja with one unlimited "I told you so" pass to use as he sees fit.

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Configuration

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This PR has been generated by Mend Renovate.

[greptile-apps]

Greptile Summary

Updates the centrally managed NSubstitute dependency from 6.0.0 to 6.1.0.

• Applies the new version to the repository's test and benchmark consumers through Central Package Management
• Reverts NSubstitute public-API nullability annotations according to the included upstream release notes

Confidence Score: 5/5

The dependency update appears safe to merge, with no concrete blocking or non-blocking defect identified.

NSubstitute is used only by test and benchmark projects that do not treat warnings as errors, and no usage depending on the reverted nullable annotations was found.

Important Files Changed

Filename	Overview
Directory.Packages.props	Bumps the central NSubstitute version to 6.1.0; no concrete compatibility or build failure was identified.

_{Reviews (1): Last reviewed commit: "chore(deps): update dependency nsubstitu..." | Re-trigger Greptile}

[claude]

Code review

No issues found. This is a trivial, automated Renovate dependency bump (NSubstitute 6.0.0 → 6.1.0) affecting a single line in Directory.Packages.props. The release notes indicate 6.1.0 reverts a problematic nullability change from 6.0.0, which is a safe, low-risk update. Nothing further to flag.